Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1 | #ifndef _DCCP_H |
| 2 | #define _DCCP_H |
| 3 | /* |
| 4 | * net/dccp/dccp.h |
| 5 | * |
| 6 | * An implementation of the DCCP protocol |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 7 | * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
Ian McDonald | e6bccd3 | 2006-08-26 19:01:30 -0700 | [diff] [blame] | 8 | * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz> |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify it |
| 11 | * under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/dccp.h> |
Arnaldo Carvalho de Melo | 9823b7b | 2007-08-19 17:16:35 -0700 | [diff] [blame] | 16 | #include <linux/ktime.h> |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 17 | #include <net/snmp.h> |
| 18 | #include <net/sock.h> |
| 19 | #include <net/tcp.h> |
Arnaldo Carvalho de Melo | ae31c33 | 2005-09-18 00:17:51 -0700 | [diff] [blame] | 20 | #include "ackvec.h" |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 21 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 22 | /* |
| 23 | * DCCP - specific warning and debugging macros. |
| 24 | */ |
Joe Perches | c0560b9 | 2014-11-06 12:53:41 -0800 | [diff] [blame] | 25 | #define DCCP_WARN(fmt, ...) \ |
| 26 | net_warn_ratelimited("%s: " fmt, __func__, ##__VA_ARGS__) |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 27 | #define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s()\n", ##a, \ |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 28 | __FILE__, __LINE__, __func__) |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 29 | #define DCCP_BUG(a...) do { DCCP_CRIT("BUG: " a); dump_stack(); } while(0) |
| 30 | #define DCCP_BUG_ON(cond) do { if (unlikely((cond) != 0)) \ |
| 31 | DCCP_BUG("\"%s\" holds (exception!)", \ |
| 32 | __stringify(cond)); \ |
Gerrit Renker | 3c69526 | 2006-11-15 21:27:47 -0200 | [diff] [blame] | 33 | } while (0) |
| 34 | |
Gerrit Renker | 8411671 | 2006-11-20 18:26:03 -0200 | [diff] [blame] | 35 | #define DCCP_PRINTK(enable, fmt, args...) do { if (enable) \ |
| 36 | printk(fmt, ##args); \ |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 37 | } while(0) |
Gerrit Renker | 8411671 | 2006-11-20 18:26:03 -0200 | [diff] [blame] | 38 | #define DCCP_PR_DEBUG(enable, fmt, a...) DCCP_PRINTK(enable, KERN_DEBUG \ |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 39 | "%s: " fmt, __func__, ##a) |
Gerrit Renker | 8411671 | 2006-11-20 18:26:03 -0200 | [diff] [blame] | 40 | |
Arnaldo Carvalho de Melo | 725ba8e | 2005-08-13 20:35:39 -0300 | [diff] [blame] | 41 | #ifdef CONFIG_IP_DCCP_DEBUG |
Rusty Russell | eb93992 | 2011-12-19 14:08:01 +0000 | [diff] [blame] | 42 | extern bool dccp_debug; |
Gerrit Renker | 8411671 | 2006-11-20 18:26:03 -0200 | [diff] [blame] | 43 | #define dccp_pr_debug(format, a...) DCCP_PR_DEBUG(dccp_debug, format, ##a) |
| 44 | #define dccp_pr_debug_cat(format, a...) DCCP_PRINTK(dccp_debug, format, ##a) |
Gerrit Renker | f3f3abb | 2009-01-16 23:36:33 +0000 | [diff] [blame] | 45 | #define dccp_debug(fmt, a...) dccp_pr_debug_cat(KERN_DEBUG fmt, ##a) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 46 | #else |
| 47 | #define dccp_pr_debug(format, a...) |
| 48 | #define dccp_pr_debug_cat(format, a...) |
Gerrit Renker | f3f3abb | 2009-01-16 23:36:33 +0000 | [diff] [blame] | 49 | #define dccp_debug(format, a...) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 50 | #endif |
| 51 | |
| 52 | extern struct inet_hashinfo dccp_hashinfo; |
| 53 | |
Eric Dumazet | dd24c00 | 2008-11-25 21:17:14 -0800 | [diff] [blame] | 54 | extern struct percpu_counter dccp_orphan_count; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 55 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 56 | void dccp_time_wait(struct sock *sk, int state, int timeo); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 57 | |
Gerrit Renker | 60361be | 2006-11-10 02:13:56 -0200 | [diff] [blame] | 58 | /* |
| 59 | * Set safe upper bounds for header and option length. Since Data Offset is 8 |
| 60 | * bits (RFC 4340, sec. 5.1), the total header length can never be more than |
| 61 | * 4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1): |
| 62 | * - DCCP-Response with ACK Subheader and 4 bytes of Service code OR |
| 63 | * - DCCP-Reset with ACK Subheader and 4 bytes of Reset Code fields |
| 64 | * Hence a safe upper bound for the maximum option length is 1020-28 = 992 |
| 65 | */ |
Gerrit Renker | 86739fb | 2009-02-27 22:38:29 +0000 | [diff] [blame] | 66 | #define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(uint32_t)) |
Gerrit Renker | 60361be | 2006-11-10 02:13:56 -0200 | [diff] [blame] | 67 | #define DCCP_MAX_PACKET_HDR 28 |
| 68 | #define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR) |
| 69 | #define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 70 | |
Gerrit Renker | 86739fb | 2009-02-27 22:38:29 +0000 | [diff] [blame] | 71 | /* Upper bound for initial feature-negotiation overhead (padded to 32 bits) */ |
| 72 | #define DCCP_FEATNEG_OVERHEAD (32 * sizeof(uint32_t)) |
| 73 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 74 | #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT |
| 75 | * state, about 60 seconds */ |
| 76 | |
Gerrit Renker | 0e64e94 | 2006-10-24 16:17:51 -0700 | [diff] [blame] | 77 | /* RFC 1122, 4.2.3.1 initial RTO value */ |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 78 | #define DCCP_TIMEOUT_INIT ((unsigned int)(3 * HZ)) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 79 | |
Gerrit Renker | 28be544 | 2007-12-13 12:16:23 -0200 | [diff] [blame] | 80 | /* |
| 81 | * The maximum back-off value for retransmissions. This is needed for |
| 82 | * - retransmitting client-Requests (sec. 8.1.1), |
| 83 | * - retransmitting Close/CloseReq when closing (sec. 8.3), |
| 84 | * - feature-negotiation retransmission (sec. 6.6.3), |
| 85 | * - Acks in client-PARTOPEN state (sec. 8.1.5). |
| 86 | */ |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 87 | #define DCCP_RTO_MAX ((unsigned int)(64 * HZ)) |
Gerrit Renker | 4712a79 | 2007-03-20 15:23:18 -0300 | [diff] [blame] | 88 | |
Gerrit Renker | 954c2db | 2007-12-12 14:06:14 -0200 | [diff] [blame] | 89 | /* |
| 90 | * RTT sampling: sanity bounds and fallback RTT value from RFC 4340, section 3.4 |
| 91 | */ |
Gerrit Renker | 4712a79 | 2007-03-20 15:23:18 -0300 | [diff] [blame] | 92 | #define DCCP_SANE_RTT_MIN 100 |
Gerrit Renker | 954c2db | 2007-12-12 14:06:14 -0200 | [diff] [blame] | 93 | #define DCCP_FALLBACK_RTT (USEC_PER_SEC / 5) |
| 94 | #define DCCP_SANE_RTT_MAX (3 * USEC_PER_SEC) |
Gerrit Renker | 4712a79 | 2007-03-20 15:23:18 -0300 | [diff] [blame] | 95 | |
Gerrit Renker | 2e2e9e9 | 2006-11-13 13:23:52 -0200 | [diff] [blame] | 96 | /* sysctl variables for DCCP */ |
| 97 | extern int sysctl_dccp_request_retries; |
| 98 | extern int sysctl_dccp_retries1; |
| 99 | extern int sysctl_dccp_retries2; |
Ian McDonald | b1308dc | 2006-11-20 18:30:17 -0200 | [diff] [blame] | 100 | extern int sysctl_dccp_tx_qlen; |
Gerrit Renker | a94f0f9 | 2007-09-26 11:31:49 -0300 | [diff] [blame] | 101 | extern int sysctl_dccp_sync_ratelimit; |
Gerrit Renker | 2e2e9e9 | 2006-11-13 13:23:52 -0200 | [diff] [blame] | 102 | |
Gerrit Renker | 6b811d4 | 2007-03-20 12:26:51 -0300 | [diff] [blame] | 103 | /* |
| 104 | * 48-bit sequence number arithmetic (signed and unsigned) |
| 105 | */ |
| 106 | #define INT48_MIN 0x800000000000LL /* 2^47 */ |
| 107 | #define UINT48_MAX 0xFFFFFFFFFFFFLL /* 2^48 - 1 */ |
| 108 | #define COMPLEMENT48(x) (0x1000000000000LL - (x)) /* 2^48 - x */ |
| 109 | #define TO_SIGNED48(x) (((x) < INT48_MIN)? (x) : -COMPLEMENT48( (x))) |
| 110 | #define TO_UNSIGNED48(x) (((x) >= 0)? (x) : COMPLEMENT48(-(x))) |
| 111 | #define ADD48(a, b) (((a) + (b)) & UINT48_MAX) |
| 112 | #define SUB48(a, b) ADD48((a), COMPLEMENT48(b)) |
| 113 | |
| 114 | static inline void dccp_set_seqno(u64 *seqno, u64 value) |
| 115 | { |
| 116 | *seqno = value & UINT48_MAX; |
| 117 | } |
| 118 | |
| 119 | static inline void dccp_inc_seqno(u64 *seqno) |
| 120 | { |
| 121 | *seqno = ADD48(*seqno, 1); |
| 122 | } |
| 123 | |
Gerrit Renker | 0aec51c | 2007-03-20 12:45:59 -0300 | [diff] [blame] | 124 | /* signed mod-2^48 distance: pos. if seqno1 < seqno2, neg. if seqno1 > seqno2 */ |
| 125 | static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2) |
Gerrit Renker | 6b811d4 | 2007-03-20 12:26:51 -0300 | [diff] [blame] | 126 | { |
Gerrit Renker | 0aec51c | 2007-03-20 12:45:59 -0300 | [diff] [blame] | 127 | u64 delta = SUB48(seqno2, seqno1); |
| 128 | |
| 129 | return TO_SIGNED48(delta); |
Gerrit Renker | 6b811d4 | 2007-03-20 12:26:51 -0300 | [diff] [blame] | 130 | } |
| 131 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 132 | /* is seq1 < seq2 ? */ |
Patrick McHardy | a10cedd | 2005-08-14 21:05:53 -0300 | [diff] [blame] | 133 | static inline int before48(const u64 seq1, const u64 seq2) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 134 | { |
Gerrit Renker | d52de17 | 2007-03-20 13:00:26 -0300 | [diff] [blame] | 135 | return (s64)((seq2 << 16) - (seq1 << 16)) > 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 136 | } |
| 137 | |
| 138 | /* is seq1 > seq2 ? */ |
Gerrit Renker | d52de17 | 2007-03-20 13:00:26 -0300 | [diff] [blame] | 139 | #define after48(seq1, seq2) before48(seq2, seq1) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 140 | |
| 141 | /* is seq2 <= seq1 <= seq3 ? */ |
Patrick McHardy | a10cedd | 2005-08-14 21:05:53 -0300 | [diff] [blame] | 142 | static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 143 | { |
| 144 | return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16); |
| 145 | } |
| 146 | |
| 147 | static inline u64 max48(const u64 seq1, const u64 seq2) |
| 148 | { |
| 149 | return after48(seq1, seq2) ? seq1 : seq2; |
| 150 | } |
| 151 | |
Gerrit Renker | 2013c7e | 2008-07-13 11:51:40 +0100 | [diff] [blame] | 152 | /** |
Ivo Calado | d196c9a | 2010-10-11 20:40:04 +0200 | [diff] [blame] | 153 | * dccp_loss_count - Approximate the number of lost data packets in a burst loss |
| 154 | * @s1: last known sequence number before the loss ('hole') |
| 155 | * @s2: first sequence number seen after the 'hole' |
Gerrit Renker | 2013c7e | 2008-07-13 11:51:40 +0100 | [diff] [blame] | 156 | * @ndp: NDP count on packet with sequence number @s2 |
Gerrit Renker | 2013c7e | 2008-07-13 11:51:40 +0100 | [diff] [blame] | 157 | */ |
Ivo Calado | d196c9a | 2010-10-11 20:40:04 +0200 | [diff] [blame] | 158 | static inline u64 dccp_loss_count(const u64 s1, const u64 s2, const u64 ndp) |
Gerrit Renker | 2013c7e | 2008-07-13 11:51:40 +0100 | [diff] [blame] | 159 | { |
| 160 | s64 delta = dccp_delta_seqno(s1, s2); |
| 161 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 162 | WARN_ON(delta < 0); |
Ivo Calado | d196c9a | 2010-10-11 20:40:04 +0200 | [diff] [blame] | 163 | delta -= ndp + 1; |
| 164 | |
| 165 | return delta > 0 ? delta : 0; |
| 166 | } |
| 167 | |
| 168 | /** |
| 169 | * dccp_loss_free - Evaluate condition for data loss from RFC 4340, 7.7.1 |
| 170 | */ |
| 171 | static inline bool dccp_loss_free(const u64 s1, const u64 s2, const u64 ndp) |
| 172 | { |
| 173 | return dccp_loss_count(s1, s2, ndp) == 0; |
Gerrit Renker | 2013c7e | 2008-07-13 11:51:40 +0100 | [diff] [blame] | 174 | } |
| 175 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 176 | enum { |
| 177 | DCCP_MIB_NUM = 0, |
| 178 | DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ |
| 179 | DCCP_MIB_ESTABRESETS, /* EstabResets */ |
| 180 | DCCP_MIB_CURRESTAB, /* CurrEstab */ |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 181 | DCCP_MIB_OUTSEGS, /* OutSegs */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 182 | DCCP_MIB_OUTRSTS, |
| 183 | DCCP_MIB_ABORTONTIMEOUT, |
| 184 | DCCP_MIB_TIMEOUTS, |
| 185 | DCCP_MIB_ABORTFAILED, |
| 186 | DCCP_MIB_PASSIVEOPENS, |
| 187 | DCCP_MIB_ATTEMPTFAILS, |
| 188 | DCCP_MIB_OUTDATAGRAMS, |
| 189 | DCCP_MIB_INERRS, |
| 190 | DCCP_MIB_OPTMANDATORYERROR, |
| 191 | DCCP_MIB_INVALIDOPT, |
| 192 | __DCCP_MIB_MAX |
| 193 | }; |
| 194 | |
| 195 | #define DCCP_MIB_MAX __DCCP_MIB_MAX |
| 196 | struct dccp_mib { |
| 197 | unsigned long mibs[DCCP_MIB_MAX]; |
Eric Dumazet | ec733b15 | 2010-03-18 20:36:06 +0000 | [diff] [blame] | 198 | }; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 199 | |
| 200 | DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 201 | #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) |
| 202 | #define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field) |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 203 | #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 204 | |
Gerrit Renker | 6f4e5ff | 2006-11-10 17:43:06 -0200 | [diff] [blame] | 205 | /* |
| 206 | * Checksumming routines |
| 207 | */ |
Ian McDonald | e961811 | 2007-05-28 16:32:26 -0300 | [diff] [blame] | 208 | static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb) |
Gerrit Renker | 6f4e5ff | 2006-11-10 17:43:06 -0200 | [diff] [blame] | 209 | { |
| 210 | const struct dccp_hdr* dh = dccp_hdr(skb); |
| 211 | |
| 212 | if (dh->dccph_cscov == 0) |
| 213 | return skb->len; |
| 214 | return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32); |
| 215 | } |
| 216 | |
| 217 | static inline void dccp_csum_outgoing(struct sk_buff *skb) |
| 218 | { |
Ian McDonald | e961811 | 2007-05-28 16:32:26 -0300 | [diff] [blame] | 219 | unsigned int cov = dccp_csum_coverage(skb); |
Gerrit Renker | 6f4e5ff | 2006-11-10 17:43:06 -0200 | [diff] [blame] | 220 | |
| 221 | if (cov >= skb->len) |
| 222 | dccp_hdr(skb)->dccph_cscov = 0; |
| 223 | |
| 224 | skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0); |
| 225 | } |
| 226 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 227 | void dccp_v4_send_check(struct sock *sk, struct sk_buff *skb); |
Gerrit Renker | 6f4e5ff | 2006-11-10 17:43:06 -0200 | [diff] [blame] | 228 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 229 | int dccp_retransmit_skb(struct sock *sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 230 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 231 | void dccp_send_ack(struct sock *sk); |
| 232 | void dccp_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
| 233 | struct request_sock *rsk); |
Gerrit Renker | 8a73cd0 | 2006-11-10 12:32:01 -0200 | [diff] [blame] | 234 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 235 | void dccp_send_sync(struct sock *sk, const u64 seq, |
| 236 | const enum dccp_pkt_type pkt_type); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 237 | |
Tomasz Grobelny | 871a2c1 | 2010-12-04 13:38:01 +0100 | [diff] [blame] | 238 | /* |
| 239 | * TX Packet Dequeueing Interface |
| 240 | */ |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 241 | void dccp_qpolicy_push(struct sock *sk, struct sk_buff *skb); |
| 242 | bool dccp_qpolicy_full(struct sock *sk); |
| 243 | void dccp_qpolicy_drop(struct sock *sk, struct sk_buff *skb); |
| 244 | struct sk_buff *dccp_qpolicy_top(struct sock *sk); |
| 245 | struct sk_buff *dccp_qpolicy_pop(struct sock *sk); |
| 246 | bool dccp_qpolicy_param_ok(struct sock *sk, __be32 param); |
Tomasz Grobelny | 871a2c1 | 2010-12-04 13:38:01 +0100 | [diff] [blame] | 247 | |
| 248 | /* |
| 249 | * TX Packet Output and TX Timers |
| 250 | */ |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 251 | void dccp_write_xmit(struct sock *sk); |
| 252 | void dccp_write_space(struct sock *sk); |
| 253 | void dccp_flush_write_queue(struct sock *sk, long *time_budget); |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 254 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 255 | void dccp_init_xmit_timers(struct sock *sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 256 | static inline void dccp_clear_xmit_timers(struct sock *sk) |
| 257 | { |
| 258 | inet_csk_clear_xmit_timers(sk); |
| 259 | } |
| 260 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 261 | unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 262 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 263 | const char *dccp_packet_name(const int type); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 264 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 265 | void dccp_set_state(struct sock *sk, const int state); |
| 266 | void dccp_done(struct sock *sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 267 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 268 | int dccp_reqsk_init(struct request_sock *rq, struct dccp_sock const *dp, |
| 269 | struct sk_buff const *skb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 270 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 271 | int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 272 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 273 | struct sock *dccp_create_openreq_child(struct sock *sk, |
| 274 | const struct request_sock *req, |
| 275 | const struct sk_buff *skb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 276 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 277 | int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 278 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 279 | struct sock *dccp_v4_request_recv_sock(struct sock *sk, struct sk_buff *skb, |
| 280 | struct request_sock *req, |
| 281 | struct dst_entry *dst); |
| 282 | struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, |
| 283 | struct request_sock *req, |
| 284 | struct request_sock **prev); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 285 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 286 | int dccp_child_process(struct sock *parent, struct sock *child, |
| 287 | struct sk_buff *skb); |
| 288 | int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, |
| 289 | struct dccp_hdr *dh, unsigned int len); |
| 290 | int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, |
| 291 | const struct dccp_hdr *dh, const unsigned int len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 292 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 293 | int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized); |
| 294 | void dccp_destroy_sock(struct sock *sk); |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 295 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 296 | void dccp_close(struct sock *sk, long timeout); |
| 297 | struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst, |
| 298 | struct request_sock *req); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 299 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 300 | int dccp_connect(struct sock *sk); |
| 301 | int dccp_disconnect(struct sock *sk, int flags); |
| 302 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
| 303 | char __user *optval, int __user *optlen); |
| 304 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
| 305 | char __user *optval, unsigned int optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 306 | #ifdef CONFIG_COMPAT |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 307 | int compat_dccp_getsockopt(struct sock *sk, int level, int optname, |
| 308 | char __user *optval, int __user *optlen); |
| 309 | int compat_dccp_setsockopt(struct sock *sk, int level, int optname, |
| 310 | char __user *optval, unsigned int optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 311 | #endif |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 312 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame^] | 313 | int dccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size); |
| 314 | int dccp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock, |
| 315 | int flags, int *addr_len); |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 316 | void dccp_shutdown(struct sock *sk, int how); |
| 317 | int inet_dccp_listen(struct socket *sock, int backlog); |
| 318 | unsigned int dccp_poll(struct file *file, struct socket *sock, |
| 319 | poll_table *wait); |
| 320 | int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 321 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 322 | struct sk_buff *dccp_ctl_make_reset(struct sock *sk, struct sk_buff *skb); |
| 323 | int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code); |
| 324 | void dccp_send_close(struct sock *sk, const int active); |
| 325 | int dccp_invalid_packet(struct sk_buff *skb); |
| 326 | u32 dccp_sample_rtt(struct sock *sk, long delta); |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 327 | |
| 328 | static inline int dccp_bad_service_code(const struct sock *sk, |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 329 | const __be32 service) |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 330 | { |
| 331 | const struct dccp_sock *dp = dccp_sk(sk); |
| 332 | |
| 333 | if (dp->dccps_service == service) |
| 334 | return 0; |
| 335 | return !dccp_list_has_service(dp->dccps_service_list, service); |
| 336 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 337 | |
Gerrit Renker | 0430ee3 | 2007-09-26 11:27:56 -0300 | [diff] [blame] | 338 | /** |
| 339 | * dccp_skb_cb - DCCP per-packet control information |
| 340 | * @dccpd_type: one of %dccp_pkt_type (or unknown) |
| 341 | * @dccpd_ccval: CCVal field (5.1), see e.g. RFC 4342, 8.1 |
| 342 | * @dccpd_reset_code: one of %dccp_reset_codes |
| 343 | * @dccpd_reset_data: Data1..3 fields (depend on @dccpd_reset_code) |
| 344 | * @dccpd_opt_len: total length of all options (5.8) in the packet |
| 345 | * @dccpd_seq: sequence number |
| 346 | * @dccpd_ack_seq: acknowledgment number subheader field value |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 347 | * |
Gerrit Renker | 0430ee3 | 2007-09-26 11:27:56 -0300 | [diff] [blame] | 348 | * This is used for transmission as well as for reception. |
| 349 | */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 350 | struct dccp_skb_cb { |
Patrick McHardy | 028b027 | 2008-04-12 18:35:41 -0700 | [diff] [blame] | 351 | union { |
| 352 | struct inet_skb_parm h4; |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 353 | #if IS_ENABLED(CONFIG_IPV6) |
Patrick McHardy | 028b027 | 2008-04-12 18:35:41 -0700 | [diff] [blame] | 354 | struct inet6_skb_parm h6; |
| 355 | #endif |
| 356 | } header; |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 357 | __u8 dccpd_type:4; |
| 358 | __u8 dccpd_ccval:4; |
Gerrit Renker | 0430ee3 | 2007-09-26 11:27:56 -0300 | [diff] [blame] | 359 | __u8 dccpd_reset_code, |
| 360 | dccpd_reset_data[3]; |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 361 | __u16 dccpd_opt_len; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 362 | __u64 dccpd_seq; |
| 363 | __u64 dccpd_ack_seq; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 364 | }; |
| 365 | |
| 366 | #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) |
| 367 | |
Gerrit Renker | 2180c41 | 2007-12-06 12:27:15 -0200 | [diff] [blame] | 368 | /* RFC 4340, sec. 7.7 */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 369 | static inline int dccp_non_data_packet(const struct sk_buff *skb) |
| 370 | { |
| 371 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; |
| 372 | |
| 373 | return type == DCCP_PKT_ACK || |
| 374 | type == DCCP_PKT_CLOSE || |
| 375 | type == DCCP_PKT_CLOSEREQ || |
| 376 | type == DCCP_PKT_RESET || |
| 377 | type == DCCP_PKT_SYNC || |
| 378 | type == DCCP_PKT_SYNCACK; |
| 379 | } |
| 380 | |
Gerrit Renker | 2180c41 | 2007-12-06 12:27:15 -0200 | [diff] [blame] | 381 | /* RFC 4340, sec. 7.7 */ |
| 382 | static inline int dccp_data_packet(const struct sk_buff *skb) |
| 383 | { |
| 384 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; |
| 385 | |
| 386 | return type == DCCP_PKT_DATA || |
| 387 | type == DCCP_PKT_DATAACK || |
| 388 | type == DCCP_PKT_REQUEST || |
| 389 | type == DCCP_PKT_RESPONSE; |
| 390 | } |
| 391 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 392 | static inline int dccp_packet_without_ack(const struct sk_buff *skb) |
| 393 | { |
| 394 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; |
| 395 | |
| 396 | return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST; |
| 397 | } |
| 398 | |
Gerrit Renker | 6b811d4 | 2007-03-20 12:26:51 -0300 | [diff] [blame] | 399 | #define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 400 | |
| 401 | static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) |
| 402 | { |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 403 | struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + |
| 404 | sizeof(*dh)); |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 405 | dh->dccph_seq2 = 0; |
| 406 | dh->dccph_seq = htons((gss >> 32) & 0xfffff); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 407 | dhx->dccph_seq_low = htonl(gss & 0xffffffff); |
| 408 | } |
| 409 | |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 410 | static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, |
| 411 | const u64 gsr) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 412 | { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 413 | dhack->dccph_reserved1 = 0; |
| 414 | dhack->dccph_ack_nr_high = htons(gsr >> 32); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 415 | dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); |
| 416 | } |
| 417 | |
| 418 | static inline void dccp_update_gsr(struct sock *sk, u64 seq) |
| 419 | { |
| 420 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 421 | |
Samuel Jero | 763dadd | 2010-12-30 12:15:41 +0100 | [diff] [blame] | 422 | if (after48(seq, dp->dccps_gsr)) |
| 423 | dp->dccps_gsr = seq; |
Gerrit Renker | 792b487 | 2009-01-16 23:36:31 +0000 | [diff] [blame] | 424 | /* Sequence validity window depends on remote Sequence Window (7.5.1) */ |
| 425 | dp->dccps_swl = SUB48(ADD48(dp->dccps_gsr, 1), dp->dccps_r_seq_win / 4); |
Gerrit Renker | 0b53d46 | 2010-10-11 20:35:40 +0200 | [diff] [blame] | 426 | /* |
| 427 | * Adjust SWL so that it is not below ISR. In contrast to RFC 4340, |
| 428 | * 7.5.1 we perform this check beyond the initial handshake: W/W' are |
| 429 | * always > 32, so for the first W/W' packets in the lifetime of a |
| 430 | * connection we always have to adjust SWL. |
| 431 | * A second reason why we are doing this is that the window depends on |
| 432 | * the feature-remote value of Sequence Window: nothing stops the peer |
| 433 | * from updating this value while we are busy adjusting SWL for the |
| 434 | * first W packets (we would have to count from scratch again then). |
| 435 | * Therefore it is safer to always make sure that the Sequence Window |
| 436 | * is not artificially extended by a peer who grows SWL downwards by |
| 437 | * continually updating the feature-remote Sequence-Window. |
| 438 | * If sequence numbers wrap it is bad luck. But that will take a while |
| 439 | * (48 bit), and this measure prevents Sequence-number attacks. |
| 440 | */ |
| 441 | if (before48(dp->dccps_swl, dp->dccps_isr)) |
| 442 | dp->dccps_swl = dp->dccps_isr; |
Gerrit Renker | 792b487 | 2009-01-16 23:36:31 +0000 | [diff] [blame] | 443 | dp->dccps_swh = ADD48(dp->dccps_gsr, (3 * dp->dccps_r_seq_win) / 4); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 444 | } |
| 445 | |
| 446 | static inline void dccp_update_gss(struct sock *sk, u64 seq) |
| 447 | { |
| 448 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 449 | |
Gerrit Renker | 792b487 | 2009-01-16 23:36:31 +0000 | [diff] [blame] | 450 | dp->dccps_gss = seq; |
| 451 | /* Ack validity window depends on local Sequence Window value (7.5.1) */ |
| 452 | dp->dccps_awl = SUB48(ADD48(dp->dccps_gss, 1), dp->dccps_l_seq_win); |
Gerrit Renker | 0b53d46 | 2010-10-11 20:35:40 +0200 | [diff] [blame] | 453 | /* Adjust AWL so that it is not below ISS - see comment above for SWL */ |
| 454 | if (before48(dp->dccps_awl, dp->dccps_iss)) |
| 455 | dp->dccps_awl = dp->dccps_iss; |
Gerrit Renker | 792b487 | 2009-01-16 23:36:31 +0000 | [diff] [blame] | 456 | dp->dccps_awh = dp->dccps_gss; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 457 | } |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 458 | |
Gerrit Renker | b3d14bf | 2010-11-10 21:21:35 +0100 | [diff] [blame] | 459 | static inline int dccp_ackvec_pending(const struct sock *sk) |
| 460 | { |
| 461 | return dccp_sk(sk)->dccps_hc_rx_ackvec != NULL && |
| 462 | !dccp_ackvec_is_empty(dccp_sk(sk)->dccps_hc_rx_ackvec); |
| 463 | } |
| 464 | |
Arnaldo Carvalho de Melo | ae31c33 | 2005-09-18 00:17:51 -0700 | [diff] [blame] | 465 | static inline int dccp_ack_pending(const struct sock *sk) |
| 466 | { |
Gerrit Renker | b3d14bf | 2010-11-10 21:21:35 +0100 | [diff] [blame] | 467 | return dccp_ackvec_pending(sk) || inet_csk_ack_scheduled(sk); |
Arnaldo Carvalho de Melo | ae31c33 | 2005-09-18 00:17:51 -0700 | [diff] [blame] | 468 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 469 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 470 | int dccp_feat_signal_nn_change(struct sock *sk, u8 feat, u64 nn_val); |
| 471 | int dccp_feat_finalise_settings(struct dccp_sock *dp); |
| 472 | int dccp_feat_server_ccid_dependencies(struct dccp_request_sock *dreq); |
| 473 | int dccp_feat_insert_opts(struct dccp_sock*, struct dccp_request_sock*, |
| 474 | struct sk_buff *skb); |
| 475 | int dccp_feat_activate_values(struct sock *sk, struct list_head *fn); |
| 476 | void dccp_feat_list_purge(struct list_head *fn_list); |
Gerrit Renker | 61e6473 | 2008-11-04 23:54:04 -0800 | [diff] [blame] | 477 | |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 478 | int dccp_insert_options(struct sock *sk, struct sk_buff *skb); |
| 479 | int dccp_insert_options_rsk(struct dccp_request_sock *, struct sk_buff *); |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 480 | u32 dccp_timestamp(void); |
| 481 | void dccp_timestamping_init(void); |
| 482 | int dccp_insert_option(struct sk_buff *skb, unsigned char option, |
| 483 | const void *value, unsigned char len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 484 | |
Arnaldo Carvalho de Melo | e55d912 | 2006-03-20 19:25:02 -0800 | [diff] [blame] | 485 | #ifdef CONFIG_SYSCTL |
Joe Perches | a402a5a | 2013-10-18 13:48:23 -0700 | [diff] [blame] | 486 | int dccp_sysctl_init(void); |
| 487 | void dccp_sysctl_exit(void); |
Arnaldo Carvalho de Melo | e55d912 | 2006-03-20 19:25:02 -0800 | [diff] [blame] | 488 | #else |
| 489 | static inline int dccp_sysctl_init(void) |
| 490 | { |
| 491 | return 0; |
| 492 | } |
| 493 | |
| 494 | static inline void dccp_sysctl_exit(void) |
| 495 | { |
| 496 | } |
| 497 | #endif |
| 498 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 499 | #endif /* _DCCP_H */ |